Automated soft tonneau cover

ABSTRACT

A retractable cover system includes a frame that provides an opening and includes laterally spaced apart guide rails and includes a drive system. A flexible cover has laterally opposing edge portions with intermittent retainers received in the guide rails. The retainers are configured to slide relative to the guide rails between first and second positions within the opening in response to actuation of the drive system. Multiple spaced apart bows extend laterally between guide rails. The bows provide a laterally and outwardly extending arc that maintains tension on the flexible cover laterally between the retainers.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Provisional Application No.62/220,412 filed Sep. 18, 2015, U.S. Provisional Application No.62/220,416 filed Sep. 18, 2015, U.S. Provisional Application No.62/220,420 filed Sep. 18, 2015, U.S. Provisional Application No.62/115,710 filed Feb. 13, 2015, U.S. Provisional Application No.62/115,720 filed Feb. 13, 2015 and U.S. Provisional Application No.62/115,772 filed Feb. 13, 2015 and is incorporated herein by reference.

BACKGROUND

This disclosure relates to cover system used, for example, as a tonneaucover of a pickup truck bed. The cover system may also be used, forexample, as a flexible roof or sunshade for vehicle applications, or fornon-vehicle applications as well.

Tonneau covers are frequently used to enclose a pickup truck bed. Softtonneau covers provide the advantage over hard covers of being able tobe stowed in a relative small space when the cover is not in use. Therehas been an effort to provide a motorized tonneau cover, but thesetonneau covers lack the advantages of soft tonneau covers, namely, theircompactness when stowed. For example, typical motorized tonneau coversresemble a roll up garage door, which incorporate numerous rigid slatspivotally linked to one another. These arrangements are heavy and bulky,occupying a significant portion of the truck bed. What is needed is amotorized soft tonneau cover that is compact, weather resistant andsufficiently robust to withstand common load conditions.

SUMMARY

In one exemplary embodiment, a retractable cover system includes a framethat provides an opening and includes laterally spaced apart guide railsand includes a drive system. A flexible cover has laterally opposingedge portions with intermittent retainers received in the guide rails.The retainers are configured to slide relative to the guide railsbetween first and second positions within the opening in response toactuation of the drive system. Multiple spaced apart bows extendlaterally between guide rails. The bows provide a laterally andoutwardly extending arc that maintains tension on the flexible coverlaterally between the retainers.

In a further embodiment of the above, each edge portion includeslongitudinally spaced perforations with one of the retainers extendingtherethrough. Each retainer includes first and second retainer portionssecured to one another and respectively arranged on first and secondsides of the flexible cover.

In a further embodiment of the above, the retainers are arranged in azipper-like configuration and are received in a track.

In a further embodiment of the above, a flap is secured to the cover andprovides the edge portions. The flap wraps about an upper side of theguide rail. An end of the cover extends beyond the flap to an uppersurface of the guide rail to enclose the retainers and the track.

In a further embodiment of any of the above, each guide rail includes astructural section and a covering section that is secured to thestructural section. A first track is provided between the structuralsection and the covering section. The retainers are received in thefirst track.

In a further embodiment of any of the above, the structural section andthe covering section respectively include first and second lips thatprovide a gap through which the flexible cover extends. The first andsecond retainer portions are configured to slide respectively on thefirst and second lips with the flexible cover under tension.

In a further embodiment of any of the above, the structural sectionincludes first, second and third walls that extend from an upper side ofthe structural section. The first wall provides the first lip. Thesecond and third walls include openings to fluidly connect the firsttrack with an outer edge of the structural section.

In a further embodiment of any of the above, the third wall and an endof the covering section include removably interlocking features. Athreaded fastener secures the covering section to the second wall.

In a further embodiment of any of the above, the multiple bows includesa last bow to which an end of the flexible cover is secured. Themultiple bows include remaining bows that are unsecured to the flexiblecover.

In a further embodiment of any of the above, a seal is mounted to thelast bow and is configured to seal against a truck bed gate.

In a further embodiment of any of the above, the guide rails include asecond track slidably supporting the bows.

In a further embodiment of any of the above, the drive system includes acassette housing. A drain is provided in the cassette housing.

In a further embodiment of any of the above, the drive system includes awiper that engages the flexible cover and is configured to removedebris.

In a further embodiment of any of the above, the cassette housing isconfigured to be arranged in a pocket provided by the truck bed. Thedrain is arranged at an exterior of the truck bed.

In a further embodiment of any of the above, the drive system includes amain roller about which the flexible cover is wrapped and unwrapped. Oneend of the flexible cover is secured to the main roller by an omega lockconfiguration.

In another exemplary embodiment, a method of operating a soft tonneaucover includes the steps of extending a cover to a closed position andsecuring an end of the cover in the closed position. The cover isretracted while in the closed position to make the cover taut.

In a further embodiment of any of the above, the securing step includeslocking a last bow to a guide rail.

In a further embodiment of any of the above, the last bow is sealedagainst a tailgate.

In a further embodiment of any of the above, the retracting stepincludes wrapping the cover about a main roller.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be further understood by reference to the followingdetailed description when considered in connection with the accompanyingdrawings wherein:

FIG. 1 schematically illustrates a pickup truck with an example coversystem embodiment with a flexible cover in a partially open positionwith respect to a truck bed.

FIG. 2 is an exploded view of a portion of the cover system embodimentshown in FIG. 1.

FIG. 3 is a cross-sectional view of a portion of the cover system in astowed position in which the flexible cover is retracted, leaving thetruck bed open.

FIG. 4 is a cross-sectional view through a guide rail of the coversystem shown in FIG. 2.

FIG. 5 is a schematic view of a cable system used to move the flexiblecover and multiple bows between various positions.

FIG. 6 is an end view of a cable drum of the cable system shown in FIG.5.

FIG. 7 is a schematic elevational view of the cable system and bows,which are tethered to one another.

FIG. 8 is an exploded perspective view of a portion of a bow.

FIG. 9 is a cross-sectional view of portions of adjacent bows.

FIG. 10 is a schematic view of ends of adjacent bows in a stowedposition within the guide rail and in which the flexible cover isretracted, leaving the truck bed open.

FIG. 11A schematically illustrates a portion of a drive system with twomotors.

FIG. 11B is a cross-sectional view through one end of an assemblyincluding a main roller and a motor.

FIG. 12 is an exploded view of the assembly shown in FIG. 11.

FIG. 13 is a cross-sectional view of the flexible cover secured to themain roller.

FIG. 14 illustrates lighting integrated with the guide rail.

FIG. 15 depicts an electrical outlet integrated with the guide rail.

FIG. 16 schematically illustrates a latching mechanism for the coversystem.

FIG. 17 diagrammatically shows a pickup passenger motor vehicle with oneembodiment of a cover system.

FIG. 18 shows the cover system according to FIG. 17 in a completelypulled-out covering position.

FIG. 19 shows a greatly enlarged, diagrammatic cross-sectionalillustration of a part region of a flat structure of the cover systemaccording to FIG. 18 in the region of a transverse bow.

FIG. 20 shows a further embodiment of a flat structure for a coversystem according to FIG. 18 in a cross-sectional illustration with atransverse bow which lies on the outside.

FIG. 21 diagrammatically shows a sectional illustration of a rear-sideclosure of the load bed, a pull-out profile of the flat structure beingprovided with an elastic hollow profile seal.

FIG. 22 diagrammatically shows a sectional illustration of a winding-upregion of a winding shaft of the cover system according to FIGS. 17 to21.

FIG. 23 diagrammatically shows the winding up of a flat structure,provided with transverse bows, of the cover system according to FIGS. 17to 22 in a partially wound-up state.

FIG. 24 diagrammatically shows a cross section through a guide railarrangement of the cover system according to FIGS. 17 and 18 in theregion of a side wall of the load bed of the pickup.

FIG. 25 shows a detail of the cover system according to FIGS. 17 to 24in the region of the guide rail arrangement according to FIG. 24.

FIG. 26 shows an exploded illustration of a part region of the coversystem according to FIGS. 17 to 25.

FIG. 27 shows an enlarged exploded illustration of an end side of atransverse bow of a flat structure of the cover system according to FIG.26.

FIG. 28 shows a perspective sectional illustration of a detail of thecover system in the region of a guide rail arrangement which liesopposite the guide rail arrangement according to FIG. 25.

FIG. 29 diagrammatically shows the guide rail arrangement according toFIG. 28 in a cross-sectional illustration with an illustration of alateral guide function for the flat structure.

FIG. 30 shows the illustration according to FIG. 29 with an additionalpictorial illustration of a water discharge function.

FIG. 31 shows an exploded illustration of the guide rail arrangementaccording to FIGS. 28 to 30 with a covering section and a structuresection.

FIG. 32 shows the opposite guide rail arrangement according to FIGS. 24and 25 in an exploded illustration, in which a spring clamping elementfor fixing the covering section on the structure section can be seen.

FIG. 33 diagrammatically shows a longitudinal sectional illustrationthrough a winding shaft of the cover system according to FIGS. 17 to 32,which winding shaft is provided with an electric drive system.

FIG. 34 shows the drive system for the winding shaft according to FIG.33 in an exploded illustration.

FIG. 35A is a cross-sectional view of another guide rail arrangement andcover retainer configuration.

FIG. 35B is a perspective end view of the guide rail arrangement shownin FIG. 35A.

FIG. 35C is a bottom perspective view of the guide rail arrangementshown in FIG. 35B with the cover and retainer partially exposed.

FIG. 36 is a cross-sectional view of yet another guide rail arrangement.

FIG. 37A is a perspective view of a tether arrangement with the cover ina fully extended/closed position.

FIG. 37B is a plan view of the tether arrangement and cover shown inFIG. 37A.

FIG. 38A is a cross-sectional view through the cover system shown inFIG. 37A taken along line 38A-38A.

FIG. 38B is a cross-sectional view through the cover system shown inFIG. 37A taken along line 38B-38B.

FIG. 38C is a cross-sectional view through the cover system shown inFIG. 37A taken along line 38C-38C.

FIG. 38D is a cross-sectional view through the cover system shown inFIG. 37A taken along line 38D-38D.

FIG. 39A schematically illustrates the tether arrangement and bowpositions with the cover in the fully extended/closed position.

FIG. 39B schematically illustrates the tether arrangement and bowpositions with the cover in a partially retracted position.

FIG. 39C schematically illustrates the tether arrangement and bowpositions with the cover in a more retracted position than shown in FIG.39B.

The embodiments, examples and alternatives of the preceding paragraphs,the claims, or the following description and drawings, including any oftheir various aspects or respective individual features, may be takenindependently or in any combination. Features described in connectionwith one embodiment are applicable to all embodiments, unless suchfeatures are incompatible.

DETAILED DESCRIPTION

This disclosure relates to a motorized, flexible cover system for use ina variety of applications. In one example, the cover system may be usedas a tonneau cover to selectively provide access to a vehicle truck bed.The cover system may also be used as a flexible roof or sunshade forvehicle applications, or for non-vehicle applications as well.

A vehicle 10 is schematically illustrated in FIG. 1. The vehicle 10includes a truck bed 12 having lateral sides 14 and a front wall 16. Agate 18 is typically pivotally attached to a rear of the truck bed 12. Acover system 20 is mounted to the top of the truck bed 12 and is movablebetween open and closed positions, including in a partially openposition, as illustrated. If desired, the cover system 20 can be movedbetween an infinite number of positions.

The cover system 20 includes a frame 22 having laterally spaced apartguide rails 24, which may be provided by aluminum extrusions. A flexiblecover 26, or soft tonneau cover, which may be constructed from typicalsoft tonneau cover materials, for example vinyl, is supported by and canslide within the guide rails 24 secured to the lateral sides 14 of thetruck bed 12. A drive system 28 slides the flexible cover 26 between theopen and closed positions along a path provided by the guide rails 24.

Multiple bows 30, 32 are longitudinally spaced apart from one anotherand arranged beneath an underside of the flexible cover 26 to support,for example, aerodynamic loads and the weight of snow. The bow 32 is thelast bow, which is farthest from the drive system 28 and nearest gate18. A seal 33 is mounted to the bow 32 and engages the gate 18 when theflexible cover 26 is in the closed position. In one example, the bows 30curve upward toward an underside of the flexible cover 26 in the lateraldirection to provide improved support.

Referring to FIGS. 2 and 3, the drive system 28 includes a cassettehousing 42 that may be constructed from multiple components tofacilitate assembly, for example, base and top portions 42 a, 42 b andtrim piece 42 c. As shown in FIG. 3, the cassette housing 42 is mountedto a preformed pocket 128 in the front wall 16 of the truck bed 12. Adrain 130 is provided in the cassette housing 42, which drains water anddebris to the exterior of the truck bed 12. A wiper or brush 45 clearsdebris from the upper surface of the flexible cover 26.

A main roller 44 is driven by one or more motors 48 to rotationallydrive the main roller 44, about which the flexible cover 26 is wrappedand unwrapped when opened and closed. In one example, a pair of motors(one shown) is housed within the main roller 44 at opposing ends. Thenumber of motors is selected based upon the application andrequirements.

The bows 30, 32 are not wrapped about the main roller 44 with theflexible cover 26 when in the stowed position (FIG. 3). Instead, thebows 30 are able to slide both with respect to the guide rails 24 andthe flexible cover 26 since the bows 30 are not affixed to either theguide rails 24 or the flexible cover 26. In the stowed position, thebows 30, 32 are retained within the guide rails 24 and stored bunchedtogether within the cassette housing 42, as shown in FIG. 3. Thus, theflexible cover 26, drive system 28 and bows 30, 32 can be packaged in avery compact arrangement, occupying a minimal amount of space within thetruck bed 12. Not wrapping the bows 30 about the main roller 44 alsoenables the use of laterally curved bows.

Referring to FIGS. 2-4, each guide rail 24 includes a structural section34 and a cover section 36 secured to the structural section 34. Brackets37 are secured to the side walls 14 by fasteners 39, as shown in FIG. 4.Holes in the brackets 37 receiving the fasteners 39 may be slotted toaccommodate adjustment during assembly.

With continuing reference to FIG. 4, a first track 38 is providedbetween the structural and cover sections 34, 36. Edges of the flexiblecover 26 include longitudinally spaced retainers 40 that are receivedwithin the first track 38. The spacing between the retainers 40 permitwater and debris to flow off of the flexible cover and out through theguide rails 24 Interlocking features between the structural and coversections 34, 36, such as tab 120 and hook 122, can be used along withfasteners 124 to secure the cover section 36 to the structural section34 and retain the flexible cover edges within the first track 38.

The flexible cover 26 wraps about the main roller 44, as shown in FIG.3, as the flexible cover 26 is moved from the close position to the openposition. An idler roller 46 is arranged approximately level with theguide rails 24 to maintain the edges of the flexible cover 26 inalignment with the first track 38 as the flexible cover 26 is extended(closed) and retracted (opened).

The bows 30, 32 are supported by and can slide within the second track70, which includes upper and lower tracks 70, 72. One set of bows 30 issupported by ends 64 a that ride along the upper track 72, and anotherset of bows 30 is supported by ends 64 b that ride along the lowertrack. The ends 64 a, 64 b respectively include first and second bases92, 94 that are wider than the width (68 in FIG. 8) of the bows toprovide stability when sliding within the tracks, as shown in FIG. 10.Since upper and lower tracks 72, 74 are used, the wide first and secondbases 92, 94 can be accommodated in overlapping relationship for compactpackaging when the bows 30 are stowed with the flexible cover 26 fullyretracted, exposing the truck bed 12. Forward and aft sides of the firstand second bases 92, 94 include angle faces 96 that assist in clearingdebris from the upper and lower tracks 72, 74.

The guide rails 24 include a third track 98 beneath the first and secondtracks 38, 70. One or more cargo attachments 100 may be provided in thethird tracks 98 to provide a feature to which straps, ropes or othercargo lashing devices may be attached. An end cap 102 may be provided inan end of the guide rails 24 to retain the components within and providea finished appearance. Lighting 170 can be integrated with the guiderails 24′ to illuminate the truck bed 12, as shown in FIG. 14.Electricity provided to the guide rails 24′ supplying 12 volts DC and/or110 or 220 volts AC, for example at an outlet 172 provided at the endcap 102.

A cable system 50, shown in FIGS. 5-7, cooperates with the main roller44 to retract and extend the flexible cover 26. The cable system 50 alsocoordinates movement of the bows 30, 32 with the flexible cover 26 whilepermitting the bows 30 to slide independently of the flexible cover 26using a tether 78 (FIG. 7), as will be explained in more detail below.

The cable system 50 includes a cable drum 52 arranged at either end ofand coaxially with the main roller 44 (FIG. 2). A pulley 54 is arrangedat an end of each guide rails 24 opposite the drive system 28. A cable56, for example, a multi-strand steel cable, wraps about each cable drum52 and pulley 54 set. In the example shown in FIG. 6, the cable drum 52includes helical grooves 90, which prevents the cable 56 from wrappingabout itself during operation which would cause undesired noise andwear. First and second idlers 58, 60 may be arranged to route the cables56 from the cassette housing 42 to the guide rails 24, as shown in FIG.5.

Referring to FIG. 7, ends of the last bow 32, which is secured to theend of the flexible cover 26, are clamped to a portion of each cable 56(one shown) at connection 76 such that the last bow 32 moves in tandemwith the cable 56. In operation, with the flexible cover 26 in aretracted position, the motor 48 is driven to unwrap the flexible cover26 from the main roller 44 and open the soft tonneau cover. The motor 48rotationally drives the cable drum 52 (along with the main roller 44) topull the last bow 32 and the flexible cover 26 via the cable system 50toward the gate 18 to draw the soft tonneau cover taut.

A tether 78 is provided on each side of the bows 30 to secure the bowsto one another. One end of the tether 78 is secured to the last bow 32nearest the gate 18, and the other end of the tether 78 is secured tothe bow 30 nearest the drive system 28. The remaining bows 30 aresecured to the tether 78 at evenly spaced intervals such that the bows30 are evenly spaced within the truck bed opening when the soft tonneaucover is in the closed position and fully extended, as shown in FIG. 7.In operation, with the flexible cover 26 in the extended position, themotor 48 is driven to wrap the flexible cover 26 about the main roller44 and open the soft tonneau cover. At the same time, the last bow 32 ispulled toward the cassette housing 42 by the cables 56. Since the bows30 are not secured to the flexible cover 26, the last bow 32 willeventually catch up with the adjacent bow, and so on, and the bows willbunch together in the stowed position (FIG. 3) once the soft tonneaucover is fully retracted. When the flexible cover 26 is again extended,the last bow 32 will pull the other bows 30 to their desired spacing viathe tether 78 (FIG. 7).

Referring to FIG. 8, the bows 30, which may be extruded aluminum, areprovided by hollow bars 62 to which opposing ends 64 are connected. Thebars 62 have a height 66 that is greater than the width, for example, byabout two times. Such a dimensional ratio provides sufficient rigidityin the load direction (downward) while providing a narrow profile so thebows 30 can be tightly packaged when stowed (FIG. 2).

As described above, when the soft tonneau cover is not fully extended,the bows 32 will begin to bunch. As a result, the tether 78 will beginto go slack between the bows 30 and would otherwise hang into the cargoarea of the truck bed. To prevent the tether 78 from hanging andpossibly becoming entangled, a tensioning member 80 pulls the tether 78out of the way. The tensioning member 80 may be constructed from aspring element or an elastomeric material.

With continuing reference to FIG. 8, the bars 62 include notches in oneexample that expose a cavity 82. Access covers 84, which include holes86, are arranged over the notches to enclose the cavities 82. Referringto FIG. 9, the tether 78 passes through the holes 86. A tensioningmember 80 is arranged in each cavity 82 and is interconnected to theopposing tethers 78 (FIG. 7) by connectors 88. Any slack in tether 78 ispulled into the cavity 82 by the tensioning member 80 (FIG. 9) such thatwhen the bows 30 are retracted and come closer to one another thetethers 78 will be prevented from hanging into the cargo box andbecoming tangled in cargo.

Returning to FIG. 4, the edges of the flexible cover 26 includeperforations 104. The retainers 40 extend through the perforations andinclude first and second portions 106, 108 arranged on opposing sides ofthe flexible cover 26. First and second lips 110, 112 are respectivelyprovided by the structural and cover sections 34, 36. When the flexiblecover 26 is laterally tensioned during use, the retainer 40 will rideagainst the first and second lips 110, 112. The structural section 34includes first, second and third walls 114, 116, 118 that extendupwardly therefrom. The first wall 114 provides the first lip 110. Thesecond and third walls 116, 118 include an opening 126 (shown by dashedlines) that fluidly connect the first track 38 with an outer edge of thestructural section 34 to permit water to drain off of the flexible cover26. The third wall 118 provides the tab 120.

Referring to FIGS. 11A, 11B and 12, the cassette housing 42 includes anend 132 at opposing lateral sides. Although only one motor 48 is shownin FIG. 11B, two motors 48 can be used as shown in FIG. 11A. Each end132 includes an arcuate guide 134 that guides the edges of the flexiblecover 26 between the main roller 44 and the first track 38. An insideface of the end 132 includes a bearing 136 that supports an innerdiameter of the cable drum 52. The motor 48 includes a fixed end 138secured to the end 132 by fasteners. A drive end 140 of the motor 48 iscoupled to a motor housing 142, by a coupling 144. The motor housing 142includes support rings 146 at an outer diameter that supports the mainroller 44. The flexible cover 26 is secured to the main roller 44 by an“omega lock” configuration in which the flexible cover 26 is retained ina slot 158 by a cord 160, as shown in FIG. 13.

The motor housing 142 includes an enlarged neck 148 that receives asleeve 154. A resilient member such as a torsion spring 152 is arrangedradially between the sleeve 154 and the motor housing 142. One end ofthe torsion spring 152 is received in an aperture 150 of the motorhousing 142, and another end of the torsion spring 152 is received in anaperture 156 of the cable drum 52.

The torsion spring 152 permits some relative rotation between the mainroller 44 and the cable drum 52 as the flexible cover 26 is wrapped andunwrapped about the main roller 44. This is desirable since the cables56 do not stretch during operation and the flexible cover 26 does. Theouter diameter of the sleeve 154 and the inner diameter of the motorhousing 142 provide the limits for relative angular movement between themain roller 44 and the cable drum 52 by acting as stops.

The motor 48 communicates with a controller 162 that receives commandsfrom an input 164, such as a two-way switch, to open and close the softtonneau cover. The controller 162 can provide a variety offunctionality, for example, the controller may be configured to detectan obstruction to the flexible cover 26 within the truck bed 12. Thecontroller 162 commands the motor 48 to open the flexible cover 26 inresponse to detecting the obstruction. In another example, thecontroller 162 may be programmed to open/close the flexible cover 26 toa predetermined position.

It may become necessary or desirable to operate the electric tonneaucover without use of the motor 48. Thus, the motor 48 may include aclutch 166 actuatable by an override device 168 to release the mainroller 44 from the motor 48.

FIG. 16 schematically illustrates a latching mechanism 178 that is usedto lock the flexible cover 26 when fully closed/extended. Each guiderail 34 (only one shown) includes a latch 182 that selectivelycooperates with a stop 180 associated with the bow 32, for example. Thesoft tonneau cover will latch/lock when the flexible cover 26 is fullyextended/closed. The motor 48 then rotates the main roller 44 slightlyas if the cover 26 is being retracted. However, since the last bow 32 ismaintained in its position near the tailgate, the cover 26 is pulledtaut. In this manner, the cover 26 is tensioned and prepared for vehicletravel to better withstand aerodynamic loads. When a user wishes to openthe cover 26, a command from the controller 162 is sent to an actuator184 that first releases the latch 182, and then the flexible cover 26can retract/open.

Another motorized, flexible cover system is illustrated in FIGS. 17-34.A vehicle 201 has a passenger cell with front and rear seats in a frontregion. Toward a rear of the pickup passenger motor vehicle, thepassenger cell is adjoined by a pickup truck bed or load bed 202 whichis delimited on all sides by upwardly protruding walls 203 to 205. Theload bed 202 has a substantially horizontal floor. A front wall 205which is extended in the vehicle transverse direction, is guided upwardat a right angle with respect to the floor and is arranged immediatelybehind the passenger cell protrudes on the front side from the floor.Opposite longitudinal sides of the load bed 202 are formed by two sidewalls 204 which are extended in the vehicle longitudinal direction andlikewise protrude upward from the floor. The side walls 204 open on therear side into a rear wall 203 which is extended in the vehicletransverse direction and forms a rear-side termination of the load bed202 which is open at the top. The rear wall 203 is provided in a mannerwhich is not shown with a tailgate which can be folded rearward anddownward, in order to make rear-side access to the load bed 202possible.

In order for it to be possible to close the load bed 202 in an upperedge region of the walls 203 to 205, a cover system 206 is providedwhich will be described in greater detail in the following text usingFIGS. 18 to 34. The cover system 206 has a tarpaulin-like, flexible flatstructure, or flexible cover 207, which is held on a winding shaft 216such that it can be wound up and unwound. The winding shaft 216 ismounted rotatably in a cassette housing 208 which serves as supportstructure, the cassette housing 208 being mounted in the region of thefront wall 205 in the mounted state in the region of the load bed 202 ofthe vehicle 201. To this end, the front wall 205 has a cutout which isindicated in FIG. 17 and into which the cassette housing 208 is insertedin a flush manner. In the mounted operating state of the cover system206, the winding shaft 216 and therefore also the cassette housing 208extend in the vehicle transverse direction over a width of the load bed202.

Two guide rail arrangements 209 which are connected to the front endregions of the cassette housing protrude parallel to one another fromopposite front end regions of the cassette housing 208 in the pull-outdirection of the flexible cover 207. In the mounted operating state ofthe cover system 206, the guide rail arrangements 209 protrude rearwardin the vehicle longitudinal direction from the cassette housing 208 asfar as toward the rear wall 203, the guide rail arrangements 209flanking the flexible cover 207 on its longitudinal sides which lieopposite one another.

As can be seen using FIG. 24, each guide rail arrangement 209 isconnected fixedly via at least one fastening fitting 223 andcorresponding fastening screws 224 to the corresponding side wall 204 ofthe load bed 202. Here, first of all the respectively correspondingfastening fitting 223 is fastened to the side wall 204 by way ofcorresponding fastening screws 224, before subsequently the guide railarrangement 209 is placed onto the at least one fastening fitting and isconnected to the latter via floor-side fastening screws 224. Thecassette housing 208 and the guide rail arrangements 209 form thestationary sections of the cover system 206, which stationary sectionsare connected fixedly via corresponding mechanical fasteners, such as,in particular, the fastening fittings 223, to the walls 204, 205 of theload bed 202 of the vehicle 201.

The flexible flexible cover 207 which is formed by a single-layer ormultiple-layer textile or film web is reinforced over its length by wayof a plurality of transverse bows 210, 210 a which are positioned atuniform spacings from one another. The transverse bows 210, 210 a have aconvexly curved, arcuate cross-sectional profile, as can be seen clearlyusing FIGS. 19 to 23. The transverse bows 210, 210 a are ofdimensionally stable design and extend over an entire width of theflexible cover 207 in the vehicle transverse direction, in relation tothe mounted operating state of the cover system 206. The transverse bowsare oriented relative to the flexible cover 207 in such a way that theconvex curvature of the transverse bows 210, 210 a protrudes upward inthe horizontally pulled-out covering position of the flexible cover 207(FIG. 18), whereas the correspondingly concave curvature protrudestoward the load floor of the load bed 202. All the transverse bows 210are connected in a positively locking manner via weather stripconnections 212, 213 to the flexible cover 207. To this end,corresponding connecting sections 207′ which extend in each case over awidth of the flexible cover 207 have in each case one weather strip 213which is pulled into in each case one weather strip groove 212 which isextended in the longitudinal direction of the transverse bows 210, 210a, and therefore in the vehicle transverse direction in the mountedstate. The connecting sections 207′ of the flexible cover 207 areconnected fixedly to the flexible cover 207 in the region of seams 340,340′, in particular by way of welding, sewing or in another way.

As can be seen using FIGS. 19 to 23, two different variants areprovided, in order to reinforce the flexible cover 207 by way of thetransverse bows 210, 210 a transversely with respect to the pull-outdirection. In the embodiment according to FIGS. 19 and 22, thetransverse bows 210 a are arranged in the region of an underside of theflexible cover 207, that is to say on a side of the flexible cover 207which faces the floor of the load bed 202. To this end, the connectingsections 207′ are connected fixedly in the region of seams 340 to theflexible cover 207. The connecting sections 207′ are guided on theoutside around the convex curvature of the transverse bow 210 a and arefixed in a positively locking manner in two lateral weather stripgrooves 212 with the aid of corresponding weather strip cords 213.

In the embodiment according to FIGS. 20, 21 and 33, the connectingsections 207′ are fastened via seams 340′ in the region of an upper sideof the flexible cover 207 and, including a common weather strip cord213, protrude upward from the upper side of the flexible cover 207. Inthis variant, the corresponding transverse bow 210 is positioned visiblyon the upper side of the flexible cover 207 and is connected in apositively locking manner via a middle, centrally arranged weather stripgroove 212 to the connecting sections 207′ and the weather strip cord213 of the weather strip connection.

Each transverse bow 210, 210 a is manufactured as a dimensionally stablehollow profile made from metal or from plastic, preferably in anextrusion process or an injection molding process.

All the transverse bows 210, 210 a are designed identically to oneanother. A transverse bow 210 (FIGS. 18 and 21) which is arranged on theend side in the pull-out direction on a front end region of the flexiblecover 207 is additionally provided on a longitudinal side which liesaway from the flexible cover 207 with a hollow profile seal 211 whichextends over an entire length of the transverse bow 210. The hollowprofile seal 211 is formed in one piece from an elastomer body and canbe deformed elastically. The hollow profile seal 211 has a waterdischarge lug 215 which, in the pulled-out covering position of theflexible cover 207 (FIGS. 18 and 21), protrudes rearward beyond an upperedge of the rear wall 203. In the covering position, in which the loadbed 202 is closed completely, the hollow profile seal 211 bearssealingly against the rear wall 203 in an elastically deformed manner inthe region of a corresponding boundary edge of said rear wall 203, thewater discharge lug 215 which is extended over the entire length of thehollow profile seal 211 being positioned above the upper edge of therear wall 203 according to FIG. 21 and partially protruding obliquelyrearward beyond the upper side of the upper edge of the rear wall 203.Accordingly, the hollow profile seal 211 forms a water-tight terminationof the flexible cover 207 with the rear wall 203 in the closed coveringposition of the flexible cover 207.

Each transverse bow 210, 210 a is provided on its opposite end sideswith in each case one sliding body 233 which can be plugged in anon-positive manner via plug-in profiles 234 in the form of plug-injournals into complementary, end-side plug-in profiles of the transversebow 210, 210 a in the form of plug-in sockets 214. The sliding body 233forms an end-side termination of the end side of the respectivetransverse bow 210, 210 a. All the transverse bows 210, 210 a areprovided in each case with corresponding sliding bodies 233 on their endsides which lie opposite one another, as can be seen using FIG. 27. Onan outer side which faces away from the transverse bow 210, 210 a, eachsliding body 233 has a horizontally extended guide blade (not denoted ingreater detail) which is mounted in a guide groove 229 (which will bedescribed in greater detail in the following text) of the respectiveguide rail arrangement 209 such that it can be moved slidingly along theguide rail arrangement 209. The guide blade is provided on the edge sidewith an upwardly protruding retaining cam 235 which ensures positivelylocking retention of the respective sliding body 233 in the vehicletransverse direction within the guide groove 229 of the guide railarrangement 209.

Apart from one exception, the sliding bodies 233 of all the transversebows 210, 210 a are designed identically to one another. This is becausethe end-side transverse bow 210 which forms an end-side termination ofthe flexible cover 207 is provided with a modified sliding body 233 a.The sliding body 233 a (FIG. 26) is provided with an additional driverlug M which protrudes downward in a hook-like manner and interacts in apositively locking manner with a corresponding web G of a drive body 232in a manner which will be described in greater detail in the followingtext. On its end sides which lie opposite one another, the end-sidetransverse bow 210 has in each case one sliding body 233 a of this typewhich is provided with a corresponding driver lug M.

In each case one drive body 232 is mounted longitudinally displaceablyin each of the two guide rail arrangements 209, which drive body 232 isprovided in each case with a corresponding web G which enters into aplug-in connection with the corresponding driver lug M in the pull-outdirection of the flexible cover 207. To this end, the hook-shaped driverlug M of each sliding body 233 a is open to the rear toward the cassettehousing 208, with the result that the corresponding web G can dip intothe open side of the driver lug M, in order for it to be possible todrive the driver lug M and therefore the sliding body 233 a in thepull-out direction in a positively locking manner. The plug-inconnection which is produced as a result between the corresponding web Gand the driver lug M has a force flow of such a magnitude that theplug-in connection between the sliding body 233 a and the drive body 232is not released even in the case of a movement in the opposite directionof the drive body 232 in the winding-up direction of the flexible cover207.

The two drive bodies 232 are mounted in each case in a drive channel 227of the respective guide rail arrangement 209 such that they can be movedslidingly along the respective guide rail arrangement 209. As can begathered from FIG. 24, the drive channel 227 is open toward the centerof the load bed 202, that is to say toward the flexible cover 207, whichotherwise also applies to the guide groove 229. The drive channel 227 isadjoined laterally to the outside in the guide rail arrangement 209 by areceiving region 230 which serves to receive a drive transmissionelement which is configured as a cable pull 219, 236, 218, 220 (FIGS. 22and 26) in the embodiment according to FIGS. 17 to 34. Both guide railarrangements 209 are identical, but are designed so as to bemirror-symmetrical with respect to one another. In each case one cablepull is integrated into both receiving regions 230 of the guide railarrangements 209 which lie opposite one another. Each cable pull isformed by a wire cable 219 which is deflected over a rear-sidedeflection roller 236 (FIG. 26) and a cassette housing-side deflectionroller 220 and is held on a cable drum 218 which is coaxial with respectto the winding shaft 216. In this way, one end of the wire cable 219 isheld on the cassette housing-side cable drum 218, whereas an oppositecable end of the wire cable 219 is connected fixedly to the respectivedrive body 232.

The respective deflection roller 236 is mounted in a stationary mannerin the respective guide rail arrangement 209 such that it can berotated. The receiving region 230, the drive channel 227 and the guidegroove 229 extend continuously with a constant cross section over theentire length of the guide rail arrangement 209.

As can be gathered from FIGS. 25, 29 and 30, the flexible cover 207 isadditionally provided on its longitudinal sides which lie opposite oneanother with a multiplicity of lateral guide elements 217 which aredesigned as bead parts and are connected fixedly to the longitudinaledges of the flexible cover 207. Here, the lateral guide elements 217 ofin each case one longitudinal side of the flexible cover 207 arepositioned in a row behind one another in the pull-out direction. Thelateral guide elements 217 protrude through the thickness of theflexible cover 207 and protrude both to the upper side and to theunderside of the respective longitudinal edge of the flexible cover 207.The thickness (as viewed in the vehicle vertical direction) of thelateral guide elements 217 is accordingly substantially greater than athickness of the flexible cover 207. The lateral guide elements 217 areguided in a positively locking manner in the vehicle transversedirection in the region of each longitudinal side of the flexible cover207 in in each case one lateral guide channel 228 of the respectiveguide rail arrangement 209. Here, the longitudinal edges of the flexiblecover 207 protrude in each case transversely with respect to thepull-out direction through a corresponding longitudinal slot into therespective lateral guide channel 228 of the guide rail arrangement 209.Accordingly, the flexible cover 207 is guided over its entire lengthwith its lateral longitudinal edges which lie opposite one another inthe guide rail arrangements 209 which lie opposite one another.

Each guide rail arrangement 209 is formed by a two-piece hollow profilemade from lightweight metal alloy, preferably an aluminum extrudedprofile, or from a suitable plastic material. The hollow profilecomprises a lower structure section 225 and an upper covering section226 which are detached from one another or can be connected to oneanother along an approximately horizontal dividing plane. Both thestructure section 225 and the covering section 226 are configured ineach case as single-piece hollow profile bodies. The structure section225 comprises the drive channel 227 and the receiving region 230 and alower half of the lateral guiding channel 228. The covering section 226comprises the guide channel 229 for the sliding bodies 233, 233 a of thetransverse bows 210, 210 a. The covering section 226 is connected to oneanother via hook-in webs which are complementary with respect to oneanother and are not denoted in greater detail in the region of thatouter side of the guide rail arrangement 209 which faces the side walls4 and via central, vertically upward or downward protruding supportingwebs which are likewise not denoted in greater detail. In the region ofthe vertical supporting webs, the joining together of the coveringsection 226 and the structure section 225 is assisted via a plurality ofspring clamping elements 231 which serve as a connection in the form ofrelief spring clamps which are bent in an S-shape. Here, the supportingwebs which are assigned to the structure section 225 have cutouts 239,into which the spring clamping elements 231 can be inserted. Thesupporting webs of the covering section 226 are plugged in a simplemanner from the top into the mounted spring clamping elements 231.Accordingly, the respective covering section 226 can be connected to theassociated structure section 225 without tools and can be dismantledagain without tools in the same way. In the region of said dividingplane between the respective covering section 226 and the structuresection 225, water discharge paths are provided distributed over theentire length of the hollow profile bodies, which water discharge paths,according to the diagrammatic illustration according to FIG. 30, candischarge water W, which strikes the flexible cover 207 from above,laterally to the outside through the hollow profile bodies via therespective side wall 204 to the vehicle outer side. The water dischargepaths are produced by way of water guide bevels 237 in the region of anupper side of the structure section 225 and by way of complementarywater discharge openings 238 in the supporting web of the associatedcovering section 226. The water discharge bevels 237 are combined withcutouts (not denoted in greater detail) of the upwardly protrudingsupporting web of the structure section 225. The water discharge bevels237 are lowered slightly obliquely downward from the middle of the upperside of the structure section 225 toward the outer side.

As can be seen using FIGS. 31 and 32, an outer-side side edge of thestructure section 225 is also interrupted by corresponding openings inthe region of the water discharge bevels 237, with the result thatunimpeded discharging of water through said openings laterally to theoutside is made possible.

As can be seen using FIGS. 22 and 23, the flexible cover 207 is woundonto the winding shaft 216 and is unwound from the latter. Here, in thewinding-up region in the region of the cassette housing 208, thetransverse bows 210, 210 a are oriented with respect to the windingshaft 16 in such a way that the convex curvature of the transverse bows210, 210 a protrudes radially to the outside relative to a rotationalaxis of the winding shaft 216. Compact winding up of the flexible cover207 together with the transverse bows 210 is ensured as a result. Inaddition, the transverse bows 210, 210 a are spaced apart from oneanother, as viewed in the pull-out direction of the flexible cover 207,in such a way that, during winding up of the flexible cover 207, thetransverse bows 210 (FIG. 23) in the different winding layers arepositioned in each case in a staggered manner with respect to oneanother. Thus, in each case one transverse bow 210 of the respectivelyouter winding layer is positioned between two transverse bows 210 whichare spaced apart from one another of a winding layer which lies radiallyfurther to the inside. This likewise ensures compact winding of theflexible cover 207 onto the winding shaft 216.

In order to ensure that the transverse bows 210, 210 a are wound ontothe winding shaft 216 in a correct, space-saving orientation, deflectionelement 221, 221′, 222′ are provided which, according to FIG. 22, causeS-bend guidance of the flexible cover 207 after exiting from the guiderail arrangement 209 and before being wound onto the winding shaft 216.The deflection element 221, 221′, 222′ are positioned in a stationarymanner in the cassette housing 8. In addition, the deflection element222′ comprises a cleaning strip 222 which cleans an upper side of theflexible cover 207. To this end, the cleaning strip 222 has brushes orother mechanical cleaning elements in the region of its surface whichinteract mechanically with that surface of the flexible cover 207 whichslides past in the region of the deflection element 222′ and achieve amechanical cleaning function as a result.

Each wire cable 219 is held such that it can be wound up and unwound ineach case on a cable drum 218 which is positioned coaxially with respectto the winding shaft 216 on opposite ends of the winding shaft 216.

FIGS. 33 and 34 show merely one cable drum 218 on a front end region ofthe winding shaft 216. The cable drum which lies opposite is arranged inthe same way and is in an operative connection with the winding shaftlike the cable drum 218 which is shown using FIGS. 217 and 218. Thecable drum 218 is mounted rotatably on an end 241 of the cassettehousing 208. To this end, the end 241 has a rotary bearing ring (notdenoted in greater detail), onto which the cable drum 218 is plugged. Inaddition, a stator part of a tubular motor 240 is fastened to the end241, which tubular motor 240 protrudes coaxially into the winding shaft216 which is designed as a rotationally symmetrical hollow profile. Thestator part of the tubular motor 240 is connected fixedly on the endside to the end 241 of the cassette housing 208 via fasteners 242. Inaddition, the tubular motor 240 has a rotor part which is mounted in thestator part such that it can be rotated coaxially with respect to therotational axis of the winding shaft and has a torque transmissionsection 243 which protrudes axially to the outside beyond the statorpart and is connected in a rotationally locking manner to a motorhousing 245. The rotationally locking connection of the torquetransmission section 243 of the rotor part of the tubular motor 240 tothe motor housing 245 takes place via a polygonal hollow profile section244 of the motor housing 245, which hollow profile section 244 isadapted to the torque transmission section 243. The motor housing 245 isof two-shell construction, in order for it to be possible to achievesimple mounting and dismantling relative to the stator part and to thetorque transmission section 243 of the tubular motor 240. Accordingly,the motor housing 245 is mounted rotatably relative to the stator partof the tubular motor 240. On its outer shell, the motor housing 245 isprovided with integrally formed bearing rings which support the windingshaft 216 radially on the inside. In addition, the motor housing 245 hasa cylindrical plug-in section which further assists a non-positiveconnection of an inner shell of the winding shaft 216 to the motorhousing 245. Accordingly, the winding shaft 216 is connected in arotationally locking manner to the motor housing 245.

A supporting tube 246 is pushed onto the tubular motor 240 on a frontend region of the tubular motor 240, which front end region faces theend 241, on which supporting tube 246 a differential coil spring 247 inthe form of a helical spring is arranged coaxially. The differentialcoil spring 247 is connected with one spring end to the motor housing245 in a rotationally locking manner. The motor housing 245 surroundsthe differential coil spring 245 coaxially on the outer side, whereasinner-side support takes place by way of the supporting tube 246. Anopposite spring end of the differential coil spring 247 is connected tothe cable drum 248 in a rotationally locking manner.

The cable drum 218 (not shown) which lies opposite on the end side is inan operative connection in the same way via a differential coil springwith the winding shaft 216, with the result that different rotationalspeeds between the cable drums 218 and the winding shaft 216 and, at thesame time, stressing or relieving of the respective differential coilspring 247 can be achieved. Accordingly, the differential coil springs247 make it possible to compensate for different circumferential speedsbetween the respective outer-side winding layers of the flexible cover207 depending firstly on the winding or unwinding state and secondly onthe rotational movement of the cable drums. The motor housing 245 andthe winding shaft 216 are connected to one another merely in anon-positive manner in the circumferential direction, with the resultthat slipping between the winding shaft 216 and the motor housing 245 isalso made possible as soon as excessively high loads occur on thewinding shaft 216. The tubular motor 240 is an electric motor and issupplied with electrical power via current and control lines which arenot denoted in greater detail, and is controlled in a suitable way viaan electric or electronic control unit. The tubular motor 240 can berotated in both rotational directions, with the result that the windingshaft 216 can be loaded by the tubular motor 240 both in the windingdirection and in the unwinding direction.

FIGS. 35A-35C illustrate another example cover system 320. The coversystem 320 includes guide rails 324 (one shown) that supports a cover326. The cover 326 includes a flap 339 secured near an end 326 a bystitching 341 or other suitable attachment element. The retainers 340are secured to an edge of the flap 339, which is curled inward, forexample, about 180°, and received in the track 338. The retainers 340are configured similar to a zipper in which numerous discrete elementsare spaced apart from one another to permit the flap 339 to flex duringoperation. The end 326 a extends outward and beyond the flap 339 whereit rides along an upper surface of the guide rail 324 to enclose thetrack 338 and prevent debris from entering clogging the interfacebetween the retainer 340 and the track 338.

Another track 372 is arranged on an under or lower side of the guiderail 324 along which ends 364 of the bows 330 travel during operation.The interface between the ends 364 and tracks 372 are protected fromdebris at this interior location.

Another cover system 420 is illustrated in FIG. 36. In this arrangement,the ends 464 (one shown) that carry the bows 430 ride along a track 472on an upper side of the guide rail 424. The cover 426 extends about theouter surface of the end 464 and is received in another track 474 in theguide rail 424. In this manner, the end 464 and end of the cover 426wraps about the guide rail 426 to keep debris from the tracks 472, 474.

Another tether arrangement for the cover system 320 is shown in moredetail in FIGS. 37A-39C. The cover 326 is shown in an extended/closedposition in FIGS. 37A and 37B with the bows 330, 332 and tethers 378a-378 d illustrated in phantom. As shown in FIG. 37A, one or more motors348 may be positioned beneath the cassette housing 342 rather thancontained within the cassette housing. Retainer guides 343 repositionthe retainers 340 (FIGS. 35A-35C) between the curled configuration inthe guide rails 324 to a flat orientation suitable for wrapping aboutthe main roller.

Different length tethers 378 a-378 d (collectively, “378”) are securedto the last bow 332 by second ends 379 and to the underside of the cover326 by first ends 377 at a location forward of each of the bows 330, forexample, by stitching or glue. In one example, the tethers 378 areconstructed from a nylon fabric. As the cover 326 is extended to theclosed position, the tethers 378 drag the bows 330, 332 to the desiredspacing (shown in FIGS. 38A, 38B and 39A), ultimately abutting a forwardface of the bows 330. As the cover 326 is moved to the open position,shown in FIGS. 39B and 39C, the cover 326 pulls the bows forward alongthe guide rails 324 toward the stowed position.

It should also be understood that although a particular componentarrangement is disclosed in the illustrated embodiment, otherarrangements will benefit herefrom. Although particular step sequencesare shown, described, and claimed, it should be understood that stepsmay be performed in any order, separated or combined unless otherwiseindicated and will still benefit from the present invention.

Although the different examples have specific components shown in theillustrations, embodiments of this invention are not limited to thoseparticular combinations. It is possible to use some of the components orfeatures from one of the examples in combination with features orcomponents from another one of the examples.

Although an example embodiment has been disclosed, a worker of ordinaryskill in this art would recognize that certain modifications would comewithin the scope of the claims. For that reason, the following claimsshould be studied to determine their true scope and content.

What is claimed is:
 1. A retractable cover system comprising: a framethat provides an opening and includes laterally spaced apart guiderails; a drive system; a flexible cover has laterally opposing edgeportions with intermittent retainers received in the guide rails, theretainers configured to slide relative to the guide rails between firstand second positions within the opening in response to actuation of thedrive system; and multiple spaced apart bows extending laterally betweenguide rails, the bows provide a laterally and outwardly extending arcthat maintains tension on the flexible cover laterally between theretainers.
 2. The retractable cover system according to claim 1, whereineach edge portion includes longitudinally spaced perforations with oneof the retainers extending therethrough, each retainer includes firstand second retainer portions secured to one another and respectivelyarranged on first and second sides of the flexible cover.
 3. Theretractable cover system according to claim 1, wherein the retainers arearranged in a zipper-like configuration and are received in a track. 4.The retractable cover system according to claim 3, wherein a flap issecured to the cover and provides the edge portions, the flap wrapsabout an upper side of the guide rail, and an end of the cover extendsbeyond the flap to an upper surface of the guide rail to enclose theretainers and the track.
 5. The retractable cover system according toclaim 1, wherein each guide rail includes a structural section and acovering section secured to the structural section, a first trackprovided between the structural section and the covering section, theretainers received in the first track.
 6. The retractable cover systemaccording to claim 5, wherein the structural section and the coveringsection respectively include first and second lips that provide a gapthrough which the flexible cover extends, the first and second retainerportions are configured to slide respectively on the first and secondlips with the flexible cover under tension.
 7. The retractable coversystem according to claim 5, wherein the structural section includesfirst, second and third walls that extend from an upper side of thestructural section, the first wall provides the first lip, the secondand third walls include openings to fluidly connect the first track withan outer edge of the structural section.
 8. The retractable cover systemaccording to claim 7, wherein the third wall and an end of the coveringsection include removably interlocking features, and a threaded fastenersecures the covering section to the second wall.
 9. The retractablecover system according to claim 1, wherein the multiple bows includes alast bow to which an end of the flexible cover is secured, and themultiple bows include remaining bows that are unsecured to the flexiblecover.
 10. The retractable cover system according to claim 9, wherein aseal is mounted to the last bow and is configured to seal against atruck bed gate.
 11. The retractable cover system according to claim 9,wherein the guide rails include a second track slidably supporting thebows.
 12. The retractable cover system according to claim 1, wherein thedrive system includes a cassette housing, and a drain is provided in thecassette housing.
 13. The retractable cover system according to claim12, wherein the drive system includes a wiper that engages the flexiblecover and is configured to remove debris.
 14. The retractable coversystem according to claim 12, wherein the cassette housing is configuredto be arranged in a pocket provided by the truck bed, the drain arrangedat an exterior of the truck bed.
 15. The retractable cover systemaccording to claim 1, wherein the drive system includes a main rollerabout which the flexible cover is wrapped and unwrapped, and one end ofthe flexible cover is secured to the main roller by an omega lockconfiguration.
 16. A method of operating a soft tonneau cover comprisingthe steps of: extending a cover to a closed position; securing an end ofthe cover in the closed position; and retracting the cover while in theclosed position to make the cover taut.
 17. The method according toclaim 16, wherein the securing step includes locking a last bow to aguide rail.
 18. The method according to claim 17, wherein the last bowis sealed against a tailgate.
 19. The method according to claim 16,wherein the retracting step includes wrapping the cover about a mainroller.